SECTION A ENGINE: KUBOTA Contents Page No. Machine / Engine Type Table A.3 Kubota Technical Data - V2203-B A.3 Engine Maintenance Chart - V2203-B A.4 Recommended Fluids A.4 Machine / Engine Type Table A.5 Kubota Technical Data - V2203M-T A.5 Engine Maintenance Chart - V2203M-T A.6 Recommended Fluids A.7 Cooling System A.7 - A.10 Cooling System A.7 Thermostat s Valve Opening Temperature A.8 Fan Belt Tension A.9 Checking Fan Belt Damage A.9 Recommended Fluids A.10 Radiator & Radiator Cap A.11 Radiator Water Leakage A.11 Radiator Cap Air Leakage A.11 Lubrication System A.12 Oil Filter Cartridge A.12 Lubrication Oil Flows A.13 Engine Oil Flow A.13 Oil Pressure Switch A.14 Checking Engine Oil Pressure A.15 Fuel System A.15 Glow Plugs & Cylinder Heads A.16 Glow Plug A.16 Cylinder Heads A.16
SECTION A ENGINE: KUBOTA Contents Page No. Valve Clearance - V2203-B A.17 Valve Clearance - V2203M-T A.18 Trouble Shooting A.19 - A.21 Torque Figures - V2203-B A.22 Torque Figures - V2203M-T A.23 - A.24 Special Tools A.25 - A.27 Flywheel Puller A.25 Special-Use Puller Set A.25 Valve Cutter Set A.25 Diesel Engine Compression Tester A.26 Oil Pressure Test A.26 Connecting Rod Alignment Tool A.26 Press Gauge A.27 Red Check A.27 Trouble Shooting A.28 - A.30
Machine/Engine Type Table Before working on an engine, make the machine safe to work on. Machine Code Engine 950 V2203-B 994 / 653 V2003M-T Kubota Technical Data V2203-B Thermostat Tem per a ture Opening: 82 C(180 F) Completely open: 95 C(203 F) Radiator Cap Pressure Injector Pressure 1.1 Bar 15 psi 150 Bar 2133 psi Fan Belt Tension Deflection: 7-9 mm (0.28-0.35 ) Force: 10 kgf (22lbf) Valve Clearance (cold) Oil Pressure - idle Oil Pressure - Rated speed 0.15 mm 0.006 0.5 Bar 7.0 psi 2.5-4.5 Bar 36-64 psi A.3
Engine Maintenance Chart - V2203 To maintain long-lasting and safe engine performance, make it a rule to carry out regular in spec tions by following the table below. SERVICE INTERVAL ITEM EVERY EVERY EVERY EVERY EVERY EVERY EVERY EVERY EVERY 50hrs 100hrs 150hrs 400hrs 800hrs 1000hrs THREE ONE TWO MONTHS YEAR YEARS Checking fuel pipes and clamps Changing engine oil * Cleaning air filter element Cleaning fuel filter Checking fan belt tension and damage Checking water pipes and clamps Changing oil filter cartridge Changing fuel filter element Cleaning radiator interior Changing radiator cleaner and coolant Changing air filter element Checking valve clearance Checking nozzle injection pressure Changing water pipes and clamps Changing fuel pipes and clamps * Change engine oil after the first 50 hours of operation. CAUTION When Changing or inspecting, be sure to level and stop the engine, and apply parking brake. Recommended Fluids OIL TYPE Engine oil should be MIL-L-46152 / MIL-L-2104C or have properties of API classification cc/cd grades. Change the type of engine oil according to the ambient temperature. Above 25 C (77 F) - SAE 30 or 10W-30 0 C to 25 C (32-77 F) - SAE 20 or 10W-30 Below 0 C (32 F) - SAE 10W or 10W-30 ANTIFREEZE Antifreeze should always be mixed with water at a 50% mixture for general purposes. Antifreeze is poisonous and can cause irreversible nervous system damage if ingested. A.4
Machine/Engine Type Table Before working on an engine, make the machine safe to work on. Machine Code Engine 950 V2203-B 994 / 653 V2003M-T Kubota Technical Data V2003M-T Thermostat Tem per a ture Opening: 69 C(162 F) Completely open: 88 C(185 F) Radiator Cap Pressure Injector Pressure 0.9 Bar 13 psi 150 Bar 2133 psi Fan Belt Tension Deflection: 7-9 mm (0.28-0.35 ) Force: 10 kgf (22lbf) Valve Clearance (cold) Oil Pressure - idle Oil Pressure - Rated speed 0.18-0.22 mm 0.0071-0.0087 1.0 Bar 14 psi 3.0-4.5 Bar 42-64 psi CAUTION When Changing or inspecting, be sure to level and stop the engine, and apply parking brake. A.5
A.6 Engine Maintenance Chart - V2003M-T To maintain long-lasting and safe engine performance, make it a rule to carry out regular in spec tions by following the table below. SERVICE INTERVAL ITEM 50hrs 100hrs 150hrs 200hrs 400hrs 500hrs 1 or 2 1 Year 800hrs 1500hrs 3000hrs 2yrs Mths Checking fuel hoses & clamps Changing engine oil (1) Oil pan depth (90mm) (2) Oil pan depth (124mm) Cleaning air filter element (replace after cleaning x 6) Cleaning fuel filter (Element type) Checking battery electrolyte level Checking fan belt tension and damage Replacing oil filter cartridge (1) Oil pan depth (90mm) (2) Oil pan depth (124mm) Cleaning radiator hoses & clamp bands *Checking intake air line Replacing fuel filter cartridge Cleaning water jacket & radiator interior Replacing fan belt Recharging battery *Replacing air cleaner element Checking valve clearance *Checking injection nozzle condition *Checking turbocharger *Checking injection pump *Replacing intake air line Replacing battery Replacing radiator hoses & clamp bands *Replacing fuel hoses & clamps Changing radiator coolant Change engine oil and replace oil filter cartridge after the first 50 hours of operation. The items listed above (* marked) are registered as emission related critical parts by KUBOTA in the U.S. EPA nonroad emission regulation. As the engine owner, you are responsible for the performance of the required maintenance on the engine according to the above instruction.
Cooling System The cooling system consists of a radiator (1) (not included in the basic engine), centrifugal water pump (4), suction fan (2) and thermostat (3). The water is cooled through the radiator core, and the fan set behind the radiator pulls cooling air through the core to improve cooling. The water pump sucks the cooled water, forces it into the cylinder block and draws out the hot water. Then the cooling is repeated. Furthermore, to control temperature of water, a thermostat is provided in the system. When the ther mo stat opens, the water moves directly to the radiator, but when it closes, the water moves towards the water pump through the bypass between thermostat and water pump. The opening tem per a ture of thermostat is approx. 82 C (180 F). (1) Radiator (2) Suction Fan (3) Thermostat (4) Water Pump (5) Cylinder Head (6) Cylinder Block The thermostat maintains the cooling water at correct temperature. KUBOTA S engine uses a wax pellet type thermostat. Wax is enclosed in the pellet. The wax is solid at low temperatures, but turns liquid at high temperatures, expands and opens the valve. a b At low temperatures (lower then 82 C (180 F)). As the thermstat is closed, cooling water cir cu lates in the engine through the water return pipe without running to the radiator. Air in the water jacket escapes to the radiator side through leak hole (6) of the thermostat. At high temperatures (higher then 82 C (180 F)). When the temperature of cooling water ex ceeds 82 C (180 F), wax in the pellet turns liquid and expands. Because the spindle (4) is fixed, the pellet (3) is low ered, the valve (2) is separated from the seat (1), and then cooling water is sent to the radiator. (1) Seat (2) Valve (3) Pellet (4) Spindle (5) Synthetic Rubber (6) Leak Hole (7) Wax (solid) (8) Wax (liquid) A.7
Cooling System Thermostat s Valve Opening Temperature 1 Push down the thermostat valve and insert a string between the valve and valve seat. 2 Place the thermostat and a thermometer in a container with water and gradually heat the water. 3 Hold the string to suspend the thermostat in the water. When the water temperature rises, the thermostat valve will open, allowing it to fall down from the string. Read the temperature at the moment on the thermometer. 4 Continue heating the water and read the temperature when the valve has risen by about 6mm (0.236 in.). 5 If the measurement is not acceptable, replace the thermostat. Thermostat s valve opening temperature Factory spec. 80.5 to 83.5 C 176.9 to 182.3 F Temperature at which thermostat completely opens Factory spec. 95 C 203 F Danger, hot or boiling water can seriously scald and burn. A.8
Fan Belt Fan Belt Tension 1 Press the fan belt between fan pulley and pulley with your finger at force of 10 kgf (98N, 22 lbs). Check if the fan belt deflection is 7 to 9 mm (0.28 to 0.35 in.). 2 If the deflection is not within the factory specifications, adjust with the tension pulley ad just ing nut. Checking Fan Belt Damage 1 Check the fan belt for damage. 2 Check if the fan belt is worn and sunk in the pul ley groove. 3 Replace the fan belt if the belt is damaged or nearly worn out and deeply sunk into the pulley groove 4 Replace cracked or de-laminating belts. A.9
Recommended Fluids OIL TYPE Engine oil should be CF-4, CG-4 for low sulphur fuel on-road engines or have properties of API classification cc/ cd grades. When an off-road vehicle engine runs on high sulphur fuel, it is advisable to use CF, CD or CE lubricating oil with a high total base number. Change the type of engine oil according to the ambient temperature. Above 25 C (77 F) - SAE 30 or 10W-30 0 C to 25 C (32-77 F) - SAE 20 or 10W-30 Below 0 C (32 F) - SAE 10W or 10W-30 ANTIFREEZE Antifreeze should always be mixed with water at a 50% mixture for general purposes. Antifreeze is poisonous and can cause irreversible nervous system damage if ingested. A.10
Radiator & Radiator Cap The radiator cap is for sustaining the internal pressure of the cooling system at the specified level 88 kpa (0.9 kgf/cm 2, 13psi) when the en gine is in operation. The cap consists of a pres sure valve (1) a vacuum valve (2), valve springs, gasket, etc. Cooling water is pressurised by ther mal expansion of steam, and as its boiling tem per a ture rises, generation of air bubbles will be suppressed. (Air bubbles in cooling water low ers the cooling effect) (A) (A) When radiator internal pressure is high. (B) When radiator internal pressure is neg a tive. (B) (1) Pressure Valve (2) Vacuum Valve Radiator Water Leakage 1 Pour a specified amount of water into the ra di a tor. 2 Set a radiator tester (Code No. 07909-31551). In crease water pressure to the specified pres sure of 1.4 kgf/cm 2 (137 kpa, 20 psi). 3 Check each section for water leakage. 4 When water leakage is excessive, replace the ra di a tor. If water leakage is caused by a small pinhole, correct the radiator with radiator ce ment. Radiator Cap Air Leakage 1 Set a radiator tester (Code No. 07909-31551) to the radiator cap. 2 Apply the specified pressure of 0.9 kgf/cm 2 (98.1 kpa, 12.8 psi). 3 Check if the pressure drops to less then 0.6 kgf/cm 2 (59 kpa, 9 psi) in 10 seconds. 4 If the pressure is less than the factory spec i fi ca tion, replace it. A.11
Lubrication System This engine s lubricating system consists of oil strainer, oil pump, relief valve, oil filter cartridge and oil switch. The oil pump sucks lubricating oil from the oil pan through the oil strainer and the oil flows down to the filter cartridge, where it is further filtered. Then the oil is forced to crank shaft, connecting rods, idle gear, camshaft and rocker arm shaft to lubricate each part. The crankshaft can cause splash lubrication for some of the lower engine part. (A) Oil Pump (B) Oil Strainer (C) Rocker Arm and Rocker Arm Shaft (D) Piston (E) Camshaft (F) Oil Filter Cartridge and Relief Valve Oil Filter Cartridge Impurities in engine oil can cause wear and seize components as well as impairing the physical and chem i cal properties of the oil itself. Impurities con tained in force-fed engine oil are absorbed on the filter paper for re mov al as they pass through the fil ter el e ment (2). When the filter element is clogged and the oil pressure in the inlet line builds up to 98 kpa (1.0 kgf/cm 2, 14 psi) more than the outlet line, the bypass valve (1) opens and the oil flows from inlet to outlet bypassing the filter element. (1) Bypass valve (2) Filter element A.12
Lubrication Oil Flows Engine Oil Flow (1) Oil Pan (9) Big End (17) Cam shaft Bearing (2) Oil Strainer (10) Timing Gear (18) Camshaft (3) Oil Pump (11) Splash (19) Drain (4) Relief Valve (12) Bore (20) Rocker Arm (5) Oil Filter Cartridge (13) Small End (21) Oil Switch (6) Idle Gear (14) Piston (22) Rocker Arm Shaft (7) Main Oil Gallery (15) Fuel Camshaft (8) Main bearing (16) Tappets A.13
Oil Pressure Switch 1 Terminal 2 Insulator 3 Spring 4 Diaphragm 5 Contact Rivet 6 Contact 7 Oil Switch Body (A) At Proper Oil Pressure (B) At Oil Pressures of 49 kpa (0.5 kgf/cm2, 7 psi) or less (A) The oil pressure switch is mounted on the cyl in der block, to warn the operator that the lu bri cat ing oil pressure is poor. If the oil pressure falls below 49 kpa (0.5 kgf/cm 2, 7psi), the oil warning lamp will light up, warning the operator. In this case, stop the en gine immediately and check the cause of the pres sure drop. (B) A.14
Checking Engine Oil Pressure 1 Remove the oil switch and set a pressure tester (Code No. 07916-32031). 2 Start the engine. After warming up, measure the oil pressure of both idling and rated speeds. 3 If the oil pressure is less than the allowable limit, checking the following: - Engine oil insufficient - Oil strainer clogged - Excessive oil clearance of bearing - Foreign matter in the relief valve - Oil pump defective - Oil gallery clogged Danger - used engine oil contains hydro carbons and cause cancer, please wear suitable protective equipment. Fuel System Fuel from the fuel tank (1) passes through the fuel filter (2), and then enters the injection pump (3) after impurities such as dirt, water, etc. are removed. The fuel pressurised by the injection pump to the opening pressure (13.73 to 14.71 MPa, 140 to 150 kgf/cm 2, 1991 to 2062 psi), of the injection nozzle (5) is in ject ed into the combustion chamber. Part of the fuel fed to the injection nozzle (5) lubricates the moving parts of the plunger inside the nozzle, then returns to the fuel tank through the fuel over flow pipe (6 ) from the upper part of the nozzle holder. 1. Fuel Tank 2. Fuel Filter 3. Injection Pump 4. Injection Pipe 5. Injection Nozzle 6. Fuel Overflow Pipe 7. Fuel Feed Pump Danger - fuel can cause health problems if it comes into contact with skin A.15
Glow Plugs & Cylinder Heads Glow Plug 1 Disconnect the leads from the glow plugs. 2 Measure the resistance with a circuit tester across the glow plug terminal and the housing. 3 If 0 ohm is indicated, the screw at the tip of the glow plug and the housing are short-circuited. If the reference value is not indicated, the glow plug is faulty, replace the glow plug. Cylinder Heads 1 Loosen the pipe band, and remove the water return pipe. 2 Remove the cylinder head screws in the order of (14,18) to (1), and remove the cyl in der head. 3 Remove the cylinder head gasket and O-ring. (When Reassembling) - Replace the head gasket with a new one. - Install the cylinder head, using care not to damage the O-ring. Tighten the cylinder head screws gradually in the order of (1) to (14, 18) after applying engine oil. - Retighten the cylinder head screws after running the engine for 30 minutes. (A) Gear case side (B) Flywheel side A.16
! Checking Valve Clearance - V-2203-B The valve clearance should be checked and adjusted every 800 hours and when the engine is cold. 1. Removed the head cover. 2. Align the 1TC mark on the flywheel housing so that the No.1 piston comes to the compression top dead centre. 3. Center the following valuve clearnace marked with using a feel gauge. Clearance : 0.145 to 0.185 mm (0.0057 to 0.0072 in.) (When No.1 pistion is compression top dead center position) Cylinder No. No.1 No.2 No.3 No.4 Intake Valve Exhaust Valve 4. If the clearance is not within the factory specifications, adjust with the adjusting screw. 5. Then turn the flyweel 6.28 rad (360 C), and align the 1TC mark on the flywheel and the edge on the flywheel housing so that the No.1 piston comes to the overlap positions. 6. Check the following valve clearance marked with using a feeler gauge (When No.1 pistion is compression top dead center position) Cylinder No. No.1 No.2 No.3 No.4 Intake Valve Exhaust Valve 7. If the clearance is not within the factory specifications adjust with the adjusting screw with the lock nut.! Note: After adjusting the valve clearance, secure the adjusting screw with the lock nut. (1) Notched Portion (2) TC Mark Lane (3) Valve Clearance A.17
! Checking Valve Clearance - V-2003M-T IMPORTANT : Valve clearance must be checked and adjusted when engine is cold. 1. Removed the head cover. 2. Align the 1TC mark line (3) on the flywheel and projection (2) on the housing so that the No. 1 piston comes to the compression or overlap top dead center. 3. Check the following valve clearance (1) marked with using a feeler gauge. 4. If the clearance is not within the factory specifications, adjust with the adjusting screw. Valve clearance Factory spec. 0.18 to 0.22mm 0.0071 to 0.0087in 5. The TC marking line on the flywheel is just for No. 1 cylinder. There is no TC marking for the other cylinders. 6. No. 1 piston comes to the top dead center position when the TC marking is aligned with the projection (2) in the window on the fly wheel-housing. Valve V2003-M arrangement D1503-M V2203-M Adjustable D1703-M V2003-M-T cylinder D1803-M V2403-M location of piston IN. EX. IN. EX. When No. 1 piston comes to compression top dead center When No. 1 piston comes to overlap position No. 1 No. 2 No. 3 No. 4 No. 1 No. 2 No. 3 No. 4 (1) Valve clearance (2) Projection (3) TC Mark Line 7. Turn the flywheel 0.26 rad (15 ) clockwise and counterclockwise to see if the piston is at the compression top dead center or the overlap position. Now referring to the tables below, re-adjust the valve clearance (1). (The piston is at the top dead center when both the IN. and EX. valves do not move; it is at the overlap position when both the valves move). 8. Finally turn the flywheel 6.28 rad (360 ) and align the TC marking and the projection (2) perfectly. Adjust all the other valve clearance as required. 9. After turning the flywheel counterclockwise twice or three times, recheck the valve clearance (1). NOTE : After adjusting the valve clearance (1), firmly tighten the lock nut of the adjusting screw. A.18
Trouble Shooting SYMPTOM PROBLEM CAUSE SOLUTION Engine does not start Starter does not run. Engine revolution is not smooth. No fuel. Air in the fuel system. Water in the fuel system. Fuel pipe clogged. Fuel Filter clogged. Excessive high viscosity of fuel or engine oil at low temperature. Fuel with low cetane number. Fuel leak due to loose injection pipe retaining nut. Incorrect injection timing. Fuel cam shaft worn. Injection nozzle clogged. Injection pump malfunctioning. Seizure of crankshaft, camshaft, piston, cylinder liner or bearing. Compression leak from cylinder. Improper valve timing. Piston ring and liner worn. Excessive valve clearance. Battery discharge. Starter malfunctioning. Key switch malfunctioning. Wiring disconnected. Fuel filter clogged or dirty. Air cleaner clogged. Fuel leak due to loose injection pipe retaining nut. Injection pump malfunctioning. Incorrect nozzle opening pressure. Injection nozzle stuck or clogged. Fuel over flow pipe clogged. Governor malfunctioning. Replenish fuel. Vent air. Change fuel and repair or replace fuel system. Clean. Clean or change. Use the specified fuel or engine oil. Use the specified fuel Tighten nut. Adjust. Clean. Repair or replace. Repair or replace. Replace head gasket, tighten cylinder head bolt, glow plug and nozzle holder. Correct or replace timing gear Adjust. Charge. Repair or replace. Repair or replace. Connect. Clean or change. Clean or change. Tighten nut. Repair or replace. Adjust Repair or replace. Clean. Repair. A.19
Trouble Shooting SYMPTOM PROBLEM CAUSE SOLUTION Either white or blue exhaust gas is observed. Either black or dark gray exhaust gas is observed. Deficient output. Excessive lubricant oil consumption. Excessive engine oil. Piston ring and liner worn or stuck. Incorrect injection timing. Deficient compression. Overload. Low grade fuel used. Fuel filter clogged. Air cleaner clogged. Incorrect injection timing. Engines moving parts seem to be seizing. Uneven fuel injection. Insufficient fuel available at the filter Insufficient fuel flow through filter Deficient nozzle injection. Compression leak. Piston ring s gap facing the same direction. Oil ring worn or stuck. Piston ring groove and guide worn. Crankshaft bearing, and crank pin bearing worn. Reduce to the specified level. Repair or replace. Adjust. Adjust top clearance. Lessen the load. Use the specified fuel. Clean or change. Clean or change. Adjust. Repair or replace. Repair or replace the injection pump. Clean out fuel tank Re-new fuel filter Repair or replace the nozzle. Replace head gasket, tighten cylinder head bolt, glow plug and nozzle holder. Shift ring gap direction. Replace the piston Fuel mixed into lubricant oil. Water mixed into lubricant oil. Low oil pressure. Injection pump s plunger worn. Injection pump broken. Head gasket defective. Cylinder block or cylinder head flawed. Engine oil insufficient Oil strainer clogged. Relief valve stuck with dirt. Relief valve spring weaken or broken. Excessive oil clearance of crankshaft bearing. Excessive oil clearance of crank pin bearing. Excessive oil clearance of rocker arm bearing. Replace pump element or pump. Replenish. Clean. Clean. A.20
Trouble Shooting SYMPTOM PROBLEM CAUSE SOLUTION Low oil pressure Continued... High oil pressure. Engine overheated. Battery quickly discharge. Oil passage clogged. Different type of oil. Oil pump defective. Different type of oil. Relief valve defective. Engine oil insufficient. Fan belt broken or elongated. Cooling water insufficient. Radiator net and radiator fin clogged with dust. Inside of radiator corroded. Cooling water flow route corroded. Radiator cap defective. Overload running. Head gasket defective. Incorrect injection timing. Unsuitable fuel used. Battery electrolyte insufficient. Fan belt slips. Wiring disconnected. Rectifier defective. Alternator defective. Battery defective. Clean. Use the specified type of oil. Repair or replace. Use the specified type of oil. Replenish. Change or adjust. Replenish. Clean. Clean or replace. Clean or replace. Loosen the load. Adjust Use the specified fuel. Replenish distilled water and charge. Adjust belt tension or charge. Connect. Change. A.21
Torque Figures - V2203-B (1) Tightening torques for special use screws, bolts and nuts. NOTE: For * marked screws, bolts and nuts on the table, apply engine oil to their threads and seats before tightening. After well cleaning it s thread and bearing surface, fit a new head bolt (rust-preventive oil applied) without applying engine oil to it. When reusing the head bolt, apply engine oil to its thread and bearing surface before fitting it. After installing the engine, let it run for 30 minutes, and retighten the head bolt. (Before retightening it, loosen it by 30 to 90 degrees). Item Size x Pitch Nm kgf m ft-lbs * * * Head cover cap nuts. Head bolts Bearing case bolts 1 Bearing case bolts 2 Flywheel bolts Connecting rod bolts (Non flange bolt) (Flange bolt) Rocker arm bracket nuts Idle gear shaft bolts Crankshaft end nut Crankshaft end bolt (F2803-B) Glow plugs Nozzle holder assembly Oil switch taper screw Injection pipe retaining nuts M8 x 1.25 M11 x 1.25 M9 x 1.25 M10 x 1.25 M12 x 1.25 M8 x 1.0 M8 x 1.0 M8 x 1.25 M8 x 1.25 M30 x 1.5 M30 x 1.5 M10 x 1.25 M20 x 1.5 PT 1/8 M12 x 1.5 6.9 to 8.8 93.1 to 98.0 46.1 to 50.9 68.6 to 73.5 98.0 to 107.8 36.3 to 41.2 44.1 to 49.0 22.5 to 27.5 22.5 to 27.5 137.3 to 156.9 196.1 to 215.8 19.6 to 24.5 49.0 to 68.6 14.7 to 19.6 24.5 to 34.3 0.7 to 0.9 9.5 to 10.0 4.7 to 5.2 7.0 to 7.5 10.0 to 11.0 3.7 to 4.2 4.5 to 5.0 2.4 to 2.8 2.4 to 2.8 14.0 to 16.0 20.0 to 22.0 2.0 to 2.5 5.0 to 7.0 1.5 to 2.0 2.5 to 3.5 5.1 to 6.5 68.7 to 72.3 34.0 to 37.6 50.6 to 54.2 72.3 to 79.5 26.6 to 30.4 32.5 to 36.2 17.4 to 20.3 17.4 to 20.3 101.2 to 115.7 144.7 to 159.1 14.5 to 18.1 36.2 to 50.6 10.8 to 14.5 18.1 to 25.3 (2) Tightening torques for general use screws, bolts and nuts. When the tightening torques are not specified, tighten the screws, bolts and nuts according to the table below. Grad Standard Screw and Bolt Special Screw and Bolt 4 7 Nominal Diameter Unit Nm kgf.m ft-lbs Nm kgf.m ft-lbs M6 7.9 to 9.3 0.80 to 0.95 5.8 to 6.9 9.8 to 11.3 1.00 to 1.15 7.23 to 8.32 M8 17.7 to 20.6 1.8 to 2.1 13.0 to 15.2 23.5 to 27.5 2.4 to 2.8 17.4 to 20.3 M10 39.2 to 45.1 4.0 to 4.6 28.9 to 33.3 48.1 to 55.9 4.9 to 5.7 35.4 to 41.2 M12 62.8 to 72.6 6.4 to 7.4 46.3 to 53.5 77.5 to 90.2 7.9 to 9.2 57.1 to 66.5 Screw and bolt material grades are shown by numbers punched on the screw and bolt heads. Prior to tightening, be sure to check out the numbers as shown below. Punched Number None or 4 Screw and Bolt Material Grade Standard Screw and Bolt SS41, S20C 7 Special Screw and bolt S43C, S48C (refined) A.22
Torque Figures - V2003M-T (1) Tightening torques for special use screws, bolts and nuts. NOTE: For * marked screws, bolts and nuts on the table, apply engine oil to their threads and seats before tightening. The letter M in Size x Pitch means that the screw, bolt or nut dimension stands for metric. The size is the nominal outside diameter in mm of the threads. The pitch is the nominal in mm between two threads. Item Size x Pitch Nm kgf m ft-lbs * * * Cylinder head cover screw Cylinder head screw Main bearing case screw 1 Main bearing case screw 2 Flywheel screw Connecting rod screw Rocker arm bracket screw Idle gear shaft screw Fan drive pulley mounting nut Bearing case cover mounting screw Glow plug Nozzle holder assembly Nozzle holder Oil pressure switch Injection pipe retaining nut Overflow pipe assembly retaining nut Camshaft set screw Hi-idling body Balancer shaft set bolt (Balancer model only) Alternator s pulley nut Idle gear 2 stopper set screw (Side PTO model only) Idle gear 2 shaft set screw (Side PTO model only) Starter s terminal B mounting nut M6 x 1.0 M11 x 1.25 M9 x 1.25 M10 x 1.25 M12 x 1.25 M8 x 1.0 M8 x 1.25 M8 x 1.25 M30 x 1.5 M8 x 1.25 M10 x 1.25 M20 x 1.5 - R 1/8 M12 x 1.5 M12 x 1.5 M8 x 1.25 M14 x 1.0 M8 x 1.25 - - - M8 6.9 to 11.3 93.2 to 98.1 46.1 to 51.0 68.6 to 73.5 98.1 to 107.9 44.1 to 49.0 23.5 to 27.5 23.5 to 27.5 137.3 to 156.9 23.5 to 27.5 19.6 to 24.5 49.0 to 68.6 34.3 to 39.2 14.7 to 19.6 24.5 to 34.3 19.6 to 24.5 23.5 to 27.5 44.1 to 49.0 23.5 to 27.5 58.3 to 78.9 49.0 to 55.9 23.5 to 27.5 5.9 to 11.8 0.7 to 1.15 9.5 to 10.0 4.7 to 5.2 7.0 to 7.5 10.0 to 11.0 4.5 to 5.0 2.4 to 2.8 2.4 to 2.8 14.0 to 16.0 2.4 to 2.8 2.0 to 2.5 5.0 to 7.0 3.5 to 4.0 1.5 to 2.0 2.5 to 3.5 2.0 to 2.5 2.4 to 2.8 4.5 to 5.0 2.4 to 2.8 5.95 to 8.05 5.0 to 5.7 2.4 to 2.8 0.6 to 1.2 5.1 to 8.32 68.7 to 72.3 34.0 to 37.6 50.6 to 54.2 72.3 to 79.6 32.5 to 36.2 17.4 to 20.3 17.4 to 20.3 101.3 to 115.7 17.4 to 20.3 14.5 to 18.1 36.2 to 50.6 25.3 to 28.9 10.8 to 14.5 18.1 to 25.3 14.5 to 18.1 17.4 to 20.3 32.5 to 36.2 17.4 to 20.3 43.0 to 58.2 36.2 to 41.2 17.4 to 20.3 4.3 to 8.7 A.23
Torque Figures - V2003M-T (2) Tightening torques for general use screws, bolts and nuts. When the tightening torques are not specified, tighten the screws, bolts and nuts according to the table below. Grad Standard Screw and Bolt Special Screw and Bolt 4 7 Nominal Diameter Unit Nm kgf.m ft-lbs Nm kgf.m ft-lbs M6 7.9 to 9.3 0.80 to 0.95 5.8 to 6.9 9.8 to 11.3 1.00 to 1.15 7.23 to 8.32 M8 17.7 to 20.6 1.8 to 2.1 13.0 to 15.2 23.5 to 27.5 2.4 to 2.8 17.4 to 20.3 M10 39.2 to 45.1 4.0 to 4.6 28.9 to 33.3 48.1 to 55.9 4.9 to 5.7 35.4 to 41.2 M12 62.8 to 72.6 6.4 to 7.4 46.3 to 53.5 77.5 to 90.2 7.9 to 9.2 57.1 to 66.5 Screw and bolt material grades are shown by numbers punched on the screw and bolt heads. Prior to tightening, be sure to check out the numbers as shown below. Punched Number None or 4 Screw and Bolt Material Grade Standard Screw and Bolt SS41, S20C 7 Special Screw and bolt S43C, S48C (refined) A.24
Special Tools Flywheel Puller Code No: 07916-32011 Application: Use to remove the flywheel. Special-Use Puller Set Code No: 07916-09032 Application: Use for pulling out bearings, gears and other parts. Valve Cutter Set Code No: 07909-33102 Application: Use for correcting valves seats. A.25
Special Tools Diesel Engine Compression Tester Code No: 07909-30208 (Assembly) 07909-31251 (G) 07909-30934 (A to F) 07909-31271 (I) 07909-31211 (E and F) 07909-31281 (J) 07909-31231 (H) Application: Use to measure diesel engine compression and diagnosis of need for major overhaul. (1) Gauge (7) Adaptor F (2) L Joint (8) Adaptor G (3) Adaptor A (9) Adaptor H (4) Adaptor B (10) Adaptor I (5) Adaptor C (11) Adaptor J (6) Adaptor E Oil Pressure Test Code No: 07916-32032 Application: Use to measure lubricating oil pressure. (1) Gauge (5) Adaptor 2 (2) Cable (6) Adaptor 3 (3) Threaded Joint (7) Adaptor 4 (4) Adaptor 1 Connecting Rod Alignment Tool Code No: 07909-31661 Application: Use for checking the connecting rod alignment. Applicable: Connecting rod big end I.D. 30 range to 75mm (1.18 to 2.95 in.dia.) connecting rod length 65 to 330 mm (2.56 to 12.99 in.) A.26
Special Tools Press Gauge Code No: 07909-30241 Application: Use for checking the oil clearance between crankshaft and bearing etc. Measuring: range Green - 0.025 to 0.076 mm (0.001 to 0.003 in.) Red - Blue - 0.051 to 0.152 mm (0.002 to 0.006 in.) 0.102 to 0.229 mm (0.004 to 0.009 in.) Red Check (Crack Check Liquid) Code No: 07909-31371 Application: Use for checking cracks on cylinder head, cylinder block, etc. A.27
- TROUBLE SHOOTING TROUBLESHOOTING ENGINE DOES NOT START Crankshaft does not turn Crankshaft turns No or small fuel injection sounds Fuel injection sounds Frictional resistance of moving parts is too much Fuel supply to injection pump is insufficient Injection pump does not send on fuel Fuel does not inject through injection nozzle Injection mistimed Compressed air leaks Valve action timing improper Crankshaft and cam shaft have seized up Piston and cylinder liner have seized up Bearings are oil-stuck Lubrication system not working properly Starter faulty Battery capacity is low or terminal loose Fuel pipe broken Air enters fuel pipe through connection Fuel filter clogged Fuel pump faulty Control rack stays at non-injecting point Plunger is worn or seized up Delivery valve not completely oil-tight Needle valve stuck Nozzle spring broken Injection pressure maladjusted Injection pipe mounting nut loose Injection timing maladjusted Contact between intake/exhaust valve and seat not tight Intake/exhaust valve spring broken Intake/exhaust valve stuck Gasket faulty Tightness torque of cylinder head not enough Piston ring stuck Piston ring worn Cylinder liner worn Tightness torque of injection nozzle and glow plug not enough Valve clearance excessive A.28
- TROUBLE SHOOTING ENGINE DOES NOT TURN NORMALLY ENGINE OUTPUT INSUFFICIENT Revolution irregular Slow engine revolutions Revolution is not smooth at high speeds Idling not smooth Injection pump wrong Injection nozzle faulty Governor not functioning normally Idling maladjusted Fuel supply insufficient Compression pressure not enough Fuel filter clogged Fuel pipes broken or loose Air in pump Pump capacity not constant Tappet roller and pin worn Delivery valve not completely oil-tight Fuel leaks from nozzle tip Fuel not spraying properly Governor spring deformed Valve clearance incorrect Injection pump or nozzle not functioning normally Compression pressure is different among cylinders Governor sleeve not sliding properly Fork lever not functioning normally Start spring deformed Control rack not sliding properly Idling regulator maladjusted Accelerator rod maladjusted Main moving parts have seized up almost Engine overheated Injection mistimed Governor not functioning normally Filter clogged Fuel pipe broken or loose Injection pump s capacity not enough Nozzle needle valve worn Air leaking Air cleaner clogged Valve clearance incorrect A.29
- TROUBLE SHOOTING COLOUR OF EXHAUST FUMES NOT NORMAL EXCESSIVE LUBRICANT CONSUMPTION LUBRICANT INCREASING White or blue exhaust fumes Black or dark grey exhaust fumes Lubricant rises through the piston gap Injection mistimed Fuel pump s injecting capacity varying Nozzle does not inject fuel properly Fuel in lubricant Water in lubricant Gear oil in lubricant Piston ring stuck Piston ring worn Excessive gap between cylinder liner and piston Too much oil Injection delayed Compression pressure insufficient Injection too early Injection delayed Plunger does not return completely because spring is stuck or broken Plunger worn Needle valve stuck Nozzle spring broken Too much carbon sticks to nozzle tip Injection pressure too low Compressed air leaks Air not enough Excessive gap between piston and liner Piston ring stuck Piston ring worn Excessive gap between intake/exhaust valve and valve stem Valve stem seal broken Oil leaks from defective packings Injection pump plunger leaks much fuel Fuel pump leaks much fuel Head gasket packing faulty Crankcase cracked Hydraulic pump s oil seal broken A.30